Ingredient

Water-bath canning

Also known as: water-bath, boiling-water canning, hot-water-bath canning

Boiling-water immersion of sealed jars — the right ingredient for high-acid food preservation (pH < 4.6): pickles, jam, jelly, fruit preserves, tomato products acidified with lemon juice or vinegar, salsa with sufficient added acid. The acidity prevents *C. botulinum* growth, so the simpler 212°F boiling temperature suffices; no pressure required. Equipment: any large stockpot deep enough to cover jars by 1+ inch (a dedicated canner has a rack and is taller). The lower-stakes home-canning method, but still demands tested recipes — under-acidified tomato sauce or tropical-fruit jam can cross the pH threshold and become dangerous.

Inputs / outputs

Temperature: 212°F (boiling at sea level)
Time: 5–45 minutes depending on food, jar size, altitude
pH requirement: food must be ≤4.6 pH (high-acid) or acidified with lemon juice / vinegar / citric acid
Equipment: stockpot with rack, large enough to cover jars by 1 inch
Output: shelf-stable, 12 months at room temperature

Solves / unlocks

Pickled vegetables ([[cucumber|cucumber]], beet, peppers, green beans, [[asparagus|asparagus]])
Fruit jams, jellies, marmalades, preserves
Whole and halved fruit (peaches, pears, plums, applesauce)
Tomato products (sauce, paste, juice, salsa) — must be acidified
Chutneys and relishes
Fruit syrups for cocktails and beverages

Constraints

High-acid only — never water-bath low-acid foods (vegetables, meat, soup); use [[pressure-canning|pressure canning]].
Tomatoes are borderline — modern tomato varieties have lower acid than older varieties; always add lemon juice or citric acid to canned tomato products per USDA guidance.
Use tested recipes — homemade jam recipes that adjust sugar can shift pH; stick to tested ratios.
Altitude adjustment required above 1000 ft.
Two-piece lids — never reuse flat lids; rings can be reused.
Sealing is verified by lid-pop and visual inspection after cooling.

Source

USDA Complete Guide to Home Canning: https://nchfp.uga.edu/
Ball Blue Book Guide to Preserving
Food in Jars (Marisa McClellan) — modern small-batch approach

What links here, and how

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Practical

contains

Preservation toolkit method / high-acid food canning

combines with

Pressure canning complementary canning method; water-bath for high-acid (pH<4.6), pressure for low-acid (pH≥4.6)

combines

Recipe: a year of eating from one growing season the method for fruit, jam, salsa, pickles, tomato sauce

3 inbound links · 4 outbound